The skin radiuses were not even close to the specified dimensions. The
lower skin was about 1/2 inch thick and the upper skin was about 1/8.
In the upper skin I hammered a Delrin ( plastic) rod into the small radius
with a thin stick with a notched end.

The lower skin I put between the table and some boards with "C"
clamps. I slowly squeezed to get it just right, taking it out a few times
to check the progress